Which of the following is true regarding tertiary amines?

Tertiary amines are characterized by having three organic groups bonded to the nitrogen atom. This distinctive feature differentiates them from primary and secondary amines, where primary amines have one organic group and two hydrogen atoms attached to the nitrogen, and secondary amines have two organic groups and one hydrogen atom. The presence of three organic groups in tertiary amines allows for a variety of structures and functional characteristics, making them important in organic chemistry.

The other options describe incorrect characteristics of tertiary amines. For instance, stating that they have one nitrogen atom attached to three hydrogen atoms mischaracterizes them, as tertiary amines lack hydrogen atoms directly attached to the nitrogen, showing how they can interact with other molecules. Similarly, asserting that they contain no carbon atoms is incorrect, as tertiary amines must have carbon atoms within their organic groups. Finally, claiming they are the simplest form of amines overlooks the fact that primary amines represent this simplest category, with fewer structural complexities than tertiary amines.